I've been able to plot the contours for every 50mm of displacement with the command line:pscontour displacement.xyd -R -J -W0.8,100/100/100 -C50 -K -O >> $ps

I'm interested in exporting the lat lon points that outlines these contours. I have tried with the option -A50+t but this produces a text file with the lat lon locations of the annotations in the map, not the actual outline.Thank you very much for the ideas you can give me. I've attached an image of the current output.!!